Claim · model-written summary
Reversing the transpiration stream of a leaf did not move boron from the leaf to the apical meristem.
- Taxon
- sunflower plants
Helianthus annuuse0 - Organ / stage
- apical meristeme1
- Treatment
- Reversing the transpiration stream of a leaf by placing it in a dilute minus-boron nutrient solution and withholding a water supply from other organs of the plante1
- Outcome
- movement of boron from the leaf to the apical meristeme1
- Direction
- did not result ine1
Not reportedMaterialGeneCompoundInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“boron by sunflower plants (Helianthus annuus L.) grown under controlled-environment conditions”
e1“Reversing the transpiration stream of a leaf by placing it in a dilute minus-boron nutrient solution and withholding a water supply from other organs of the plant did not result in a movement of boron from the leaf to the apical meristem”
Title
Absorption and Translocation of Boron by Sunflower Plants
John G. Husa; Wayne J. McIlrath Botanical Gazette 1965. doi:10.1086/336318
Other claims from this paper (16)
- Intervention effect Exudates from detopped sunflower plants contained the same amount of boron whether roots were immersed in 500 or 1,000 μg per liter nutrient solutions.
- Intervention effect Plants given a total of 60 μg boron in varied amounts and times of application showed no differences among treatments in boron accumulation in mature leaves.
- Intervention effect Two of four multiple-application series delayed the onset of severe boron deficiency symptoms compared with a single initial 60-μg application.
- Intervention effect Significant lateral transport of boron occurred at the stem tip and in leaf blades when boron was supplied to one half of a split root system at 500 or 1,000 μg per root-half.
- Intervention effect Slight, non-significant lateral transport of boron occurred across the lower stem levels in the split-root series.
- Intervention effect Lateral transport of boron at the lower internodes was demonstrated when boron was supplied to one half of the root system at 5,000 or 10,000 μg per root half.
- Intervention effect Little or no lateral transport of boron occurred in leaves or stems with boron application of 50 or 100 μg per root-half.
- Intervention effect Mature leaves sprayed with 10-ppm boric acid solution showed an increase in dialyzable boron content.
- Intervention effect The soluble boron applied by spraying was not translocated from the leaves.
- Intervention effect No growth differences were evident between plants receiving leaf-extracted dialyzable boron and plants receiving boric acid in the nutrient solution.
- Intervention effect Non-dialyzable boron in the non-particulate fraction of leaf homogenate was not utilized by plants when added to the nutrient solution.
- Observation Some boron in the leaf was readily leached into the nutrient solution.
- Intervention effect Covering a leaf's top surface with aluminum foil to limit photosynthesis did not change its boron content.
- Intervention effect A nitrogen-deficient nutrient solution adversely decreased the capacity of plants to accumulate boron.
- Mechanism The extent and location of the metabolic requirement for boron is one of the prime factors controlling boron distribution in sunflower plants.
- Mechanism Boron immobility in sunflower leaves is proposed to result from a translocation block in the vascular tissue rather than from fixation in a non-utilizable form.